[100% 3/3] out/soong/.bootstrap/bin/soong_build out/soong/build.ninja
FAILED: out/soong/build.ninja
out/soong/.bootstrap/bin/soong_build -t -l out/.module_paths/Android.bp.list -b out/soong -n out -d out/soong/build.ninja.d -globFile out/soong/.bootstrap/build-globs.ninja -o out/soong/build.ninja Android.bp
Clang SA is not enabled
error: external/test_prog/Android.bp:1:1: dependency "libc++fs" of "test_prog" missing variant:
os:android, image:vendor.30, arch:arm64_armv8-a, sdk:, link:static, version:
available variants:
os:android, image:, arch:arm64_armv8-a, sdk:, link:static, version:
os:android, image:, arch:arm_armv7-a-neon_cortex-a9, sdk:, link:static, version:
os:android, image:recovery, arch:arm64_armv8-a, sdk:, link:static
os:linux_glibc, arch:x86, link:static
os:linux_glibc, arch:x86_64, link:static
os:windows, arch:x86, link:static
os:windows, arch:x86_64, link:static
17:10:46 soong bootstrap failed with: exit status 1
- 背景
这个错误是由于在.bp文件中引用了libc++fs库，同时这个模块声明了vendor: true属性，但libc++fs不支持vendor使用。
libc++fs这个库是external/libcxx中的一个模块，默认编译方式不允许vendor使用（Android11上C++版本较低，filesystem尚未正式标准化）
cc_binary {
name: "test_prog",
vendor: true,
static_libs: [
// "libc++experimental",
"libc++fs",
],
...
}
- 分析编译报错：
提示：编译模块test_prog依赖libc++fs，缺少可用的版本类型（variant），所需的类型已注明。这个是期望类型。
error: external/test_prog/Android.bp:1:1: dependency "libc++fs" of "test_prog" missing variant:
os:android, image:vendor.30, arch:arm64_armv8-a, sdk:, link:static, version:
同时，提示当前可用版本类型（available variants），每行是一个类型。
available variants:
os:android, image:, arch:arm64_armv8-a, sdk:, link:static, version:
os:android, image:, arch:arm_armv7-a-neon_cortex-a9, sdk:, link:static, version:
os:android, image:recovery, arch:arm64_armv8-a, sdk:, link:static
os:linux_glibc, arch:x86, link:static
os:linux_glibc, arch:x86_64, link:static
os:windows, arch:x86, link:static
os:windows, arch:x86_64, link:static
- 确认可用类型
查找编译目录，找到以下几种平台类型的静态库。前面几种arm类型的都能对应上，x86平台的只编译出来linux_glibc_x86_64_static版本，这个是和当前PC编译环境对应的，其他3中x86类型缺失是由于当前环境下不具备编译条件。
out/soong/.intermediates/external/libcxx/libc++fs$ find . -name *.a
./android_arm64_armv8-a_static_cfi/libc++fs.a
./android_arm_armv7-a-neon_cortex-a9_static/libc++fs.a
./android_recovery_arm64_armv8-a_static/libc++fs.a
./android_arm64_armv8-a_static/libc++fs.a
./linux_glibc_x86_64_static/libc++fs.a
- 定位问题
把“期望类型”和“已有类型”对比差异，逐个字段比较，看缺少哪项。
这个例子中发现缺少：image:vendor.30。可以通过libc++fs库对应的.bp文件进行确认。
cc_defaults {
name: "libc++ defaults",
host_supported: true, // <<---------编译PC主机的对应版本，linux_glibc_x86_64_static
...
}
cc_library_static {
name: "libc++_static",
defaults: ["libc++ defaults"],
vendor_available: true, // <<---------libc++的静态库vendor可用
...
}
cc_library_shared {
name: "libc++",
host_supported: true,
vendor_available: true, // <<---------libc++的动态库vendor可用
...
}
cc_library_static {
name: "libc++fs",
// <<---------无vendor_available选项，vendor不可用
recovery_available: true,
defaults: ["libc++ defaults"], // <<---------继承defaults选项，会编译pc host对应的版本，linux_glibc_x86_64_static
...
}
- 练习题
以下这个错误是什么原因？试着分析一下
FAILED: out/soong/build.ninja
out/soong/.bootstrap/bin/soong_build -t -l out/.module_paths/Android.bp.list -b out/soong -
n out -d out/soong/build.ninja.d -globFile out/soong/.bootstrap/build-globs.ninja -o out/so
ong/build.ninja Android.bp
Clang SA is not enabled
error: external/test_prog/Android.bp:1:1: dependency "vhal_v2_0_common_headers" of "test_prog" missing variant:
os:android, image:, arch:arm64_armv8-a, sdk:, version:
available variants:
os:android, image:vendor.30, arch:arm64_armv8-a, sdk:, version:
os:android, image:vendor.30, arch:arm_armv7-a-neon_cortex-a9, sdk:, version:
error: external/test_prog/Android.bp:1:1: dependency "android.hardware.automotive.vehicle@2.
0-manager-lib" of "test_prog" missing variant:
os:android, image:, arch:arm64_armv8-a, sdk:, link:shared, version:
available variants:
os:android, image:vendor.30, arch:arm64_armv8-a, sdk:, link:shared, version:
os:android, image:vendor.30, arch:arm64_armv8-a, sdk:, link:static, version:
os:android, image:vendor.30, arch:arm_armv7-a-neon_cortex-a9, sdk:, link:shared, version:
os:android, image:vendor.30, arch:arm_armv7-a-neon_cortex-a9, sdk:, link:static, version:
17:47:58 soong bootstrap failed with: exit status 1